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Study on Adsorption/Catalytic Properties of Toluene Over SBA-15

Author: ZhangZuoZuo
Tutor: QuZhenPing
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Adsorption - catalytic Silver catalyst CuAg/SBA-15 Synergy
CLC: X701
Type: Master's thesis
Year: 2011
Downloads: 71
Quote: 1
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Abstract


Volatile organic exhaust governance is a hot issue of environmental protection, the emission standard in situ adsorption - catalytic method to deal with one of the effective methods of VOCs. This method combines the adsorption method can be concentrated to a low-concentration gas enrichment and catalytic method cryogenic activated advantages, it is possible to effectively reduce the processing amount of exhaust gas and to reduce the energy consumption and does not generate secondary pollution. Adsorption in situ - the choice of adsorbent and catalyst in the catalytic method is the key to good adsorption regeneration and high adsorption activity - the catalyst has developed an important economic and practical significance. The main content of the paper is as follows: 1. Optional four different porous materials SBA-15, MCM-41, NaY and Si02 study adsorption-desorption properties of toluene. In order to further investigate the pore structure on the adsorption, the choice of two kinds of material with different pore volume of SBA-15 as a comparison. The results show that each of the samples showed the following trend: toluene adsorption capacity of NaY> SBA-15-2> SBA-15-1> MCM-41> SiO2. NaY toluene completely desorption temperature (GT; 350 ° C), it is not conducive to the recycling of materials, while the mesoporous material and the amorphous material may be at a lower temperature (LT; 150 ° C) to achieve complete desorption. Therefore, it is considered that the microporous composite structure of SBA-15 is an ideal adsorbent material, and wherein micropores exist between certain synergy Kongyou Li Yu molecular diffusion, while the microporous conducive to the adsorption of the molecule, microporous The greater the amount, the better the adsorption performance. 2 by impregnation synthesis a series Ag/SBA-15 catalyst investigated the adsorption and catalytic activity of different silver loading and pretreatment conditions. The results show that, 12.wt% Ag/SBA-15 best catalytic activity, the ignition temperature of 163 ° C. Pretreatment atmosphere and temperature state of the silver species have a great impact, low temperature processing of hydrogen had been previously treated with oxygen 500 ° C and the silver catalyst, and can be effective dispersion of silver nano-particles and to enhance its catalytic activity for toluene. Dynamic adsorption / desorption experiments, between toluene and gaseous oxygen, the competitive adsorption of gaseous oxygen is preferentially adsorbed oxygen occupy strong adsorption centers lower silver and toluene adsorption strength toluene desorption from the surface of the catalyst temperature decreases The subsurface oxygen present in the catalyst can enhance the adsorption strength of the metal with toluene, so that the desorption temperature is moved to the high temperature. 3 in order to reduce the cost of synthesis of the catalyst, the transition metal (Cu, Co, Ce, and Mn) in the above-described silver-based catalyst instead of silver. The results show that the copper-silver ratio of 1:1 a catalyst composed of the best low-temperature catalytic activity displayed toluene. The presence of silver can be effectively dispersed copper particles, and the synergy that exists between the copper and silver to promote the charge transfer between the copper and silver, and with respect to the single component reduces the activation energy of toluene, thereby improving toluene catalytic activity.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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